JP2008077062A - Scratch-resistant optical film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scratch-resistant optical film which dissolves the problem that resin coating causes performance lowering, dropping of ordinary beads and/or warp of a film to affect optical characteristics and to reduce effect of a luminance rising film. <P>SOLUTION: The subject invention relates to a scratch-resistant optical film, which comprises (a) a transparent substrate, (b) a diffusion layer on the upper side of the substrate, which has a convex and concave structure and is comprised of a first hard coat layer, and (c) a scratch-resistant layer on the lower side of the substrate, which has a smooth surface and is comprised of a second hard coat layer, wherein the first and the second hard coat layers have surface resistivity in the range from 10<SP>8</SP>to 10<SP>12</SP>Ω/square and pencil hardness of 3H or more as measured according to JIS K5400 method. The optical film of the invention has a low volume shrinkage, is hard to warp, and possesses excellent anti-static properties and high hardness properties. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a scratch-resistant optical film having a hard coating, and more particularly to a protective diffusion film applicable to a liquid crystal display (LCD).

  Since the liquid crystal panel itself cannot emit light, the backlight module serving as a light source is an important element regarding the display function of the LCD, and is very important for increasing the brightness of the LCD. Currently, various optical films are adopted in the backlight module to increase the brightness of the LCD panel without changing the design of the elements or consuming more energy, and the light source to be used most efficiently Optimizing usage efficiency has become the most economical and convenient solution. FIG. 1 is a simplified schematic diagram of a backlight module with various optical films. As shown in FIG. 1, the optical film included in a typical backlight module includes a reflective film (1) disposed on the lower side of the light guide (2); and an upper side of the light guide (2). The other optical film made, including the diffusion film (3), the brightness enhancement films (4) and (5), and the protective diffusion film (6) successively from bottom to top.

  The main functions of the brightness enhancement film include collecting scattered rays emitted from the light guide in all directions by refraction and total internal reflection, and covering the rays of about ± 35 ° in the axial direction, thereby increasing the brightness of the LCD. Strengthen. The brightness enhancement film provides a light collection effect by a regular or irregular prismatic microstructure. However, if the prismatic structure is in contact with the panel, scratches tend to occur, resulting in an impact on optical properties. Currently, there is no solution in the industry other than using a protective diffusion film (also known as an “upper diffusion film”) to prevent damage between the brightness enhancing film and the panel due to vibration during transport. This is disclosed in, for example, Taiwan Patent No. 241418 (Dai Nippon Printing Co., Ltd.). In order to obscure the prismatic stripes of the brightness enhancement film, the protective diffusion film typically used comprises a resin coating comprising organic or inorganic beads coated on the substrate surface. However, the resin coatings used so far have poor performance and usually cause problems with bead shedding and / or film deflection, thereby affecting the optical properties and reducing the effect of the brightness enhancement film.

As already mentioned, the present invention provides a scratch-resistant optical film that overcomes the aforementioned drawbacks. A new hard coat solution is selected according to the present invention and can provide a hard coat layer on the substrate to enhance the hardness of the optical film after curing, preventing the optical film from being scratched or manipulated. The prismatic structure of the brightness enhancement film is prevented from being damaged. The optical film according to the present invention is very transparent and does not bend, and can achieve the object of the present invention.
Taiwan Patent No. 241418 Specification

The main objective of the present invention is to provide a scratch-resistant optical film with no deflection, including:
(A) a transparent substrate,
(B) a diffusion layer on the upper side of the substrate having a convex and concave structure and comprising a first hard coat layer;
(C) A scratch-resistant layer on the lower side of the substrate having a smooth surface and comprising the second hard coat layer.

Here, the first and second hard coat layers have a surface resistance in the range of 10 ⁸ to 10 ¹² Ω / □ and a pencil hardness of 3H or more as measured by the JIS K5400 standard method.

  The substrate for the scratch-resistant optical film according to the present invention may be any substrate known to those skilled in the art, such as glass or plastic. The plastic substrate is not particularly limited. For example, a polyester resin such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN); a polyacrylate resin such as polymethyl methacrylate (PMMA); a polyimide resin; a polycycloolefin resin; a polycarbonate resin; Polyurethane resin; triacetate cellulose (TAC); or a mixture thereof. Preferred substrates are those formed from polyethylene terephthalate, polymethyl methacrylate, polycycloolefin resin, or triacetate cellulose, or mixtures thereof. More preferably, the substrate is polyethylene terephthalate. The thickness of the substrate is preferably in the range of 16 μm to 250 μm and usually depends on the purpose desired for the optical product.

  When a plastic substrate is used, a hard coat layer may be formed on the plastic substrate surface to enhance hardness and avoid scratches on the substrate surface, thereby providing a scratch resistance effect. Hard coat layers commonly used in the industry are typically made of UV curable resins, but the hard coat layers have non-uniform stress due to non-uniform shrinkage and cross-linking reactions, albeit with increased surface hardness. As a result, there is a tendency to bend.

In order to solve the problem with deflection, the present invention addresses the first and second hard on both the upper and lower sides of the substrate by applying and treating the hard coat solution in a way that is double cured with both heat and UV radiation. Providing a coat layer. According to the present invention, the hard coat solution used to form the first and second hard coat layers may be the same or different, in addition to the antistatic agent and the UV curable resin, It includes a thermoplastic resin, or a mixture thereof, preferably a thermosetting resin. Due to the high strength and good toughness of the thermosetting resin, the resulting hard coat layer may have excellent heat resistance and extremely low volume shrinkage, thereby overcoming the drawbacks due to deflection. In addition, the hard coat layer of the optical film according to the present invention has good antistatic properties and high hardness properties, has a surface resistance in the range of 10 ⁸ to 10 ¹² O / □, and is measured by JIS K5400 standard method. It has a pencil hardness of 3H or higher.

  The scratch-resistant optical film according to the present invention has a good light transmittance, that is, a transmittance in the range of about 85% to about 95% as measured by JIS K7136 standard method. Furthermore, in order to make the prismatic stripes of the brightness enhancement film inconspicuous, the scratch-resistant optical film according to the present invention diffuses light to a certain extent, 20% to 90% as measured by JIS K7136 standard method, Preferably it has a haze of 30% to 70%, more preferably 40% to 55%.

  In order to achieve the light diffusion effect, the first hard coat layer on the upper side of the optical film according to the present invention (that is, the light exit surface) has convex and concave microstructures and serves as a diffusion layer. The method for forming the diffusion layer is not particularly limited and may be any method well known to those skilled in the art, including, for example, screen printing, spray coating, or embossing, and the like. Not limited. In order to be able to transmit light, the diffusion layer is preferably colorless and transparent. According to an embodiment of the present invention, the thickness of the diffusion layer is in the range of 5-20 μm, preferably in the range of 6-15 μm.

  According to the present invention, a diffusion layer having convex and concave structures is preferably provided by coating a first hard coat layer containing organic particles on the top of the substrate. The particle shape is not particularly limited, but may be, for example, a sphere, an ellipse, or a diamond shape. The type of particles is not particularly limited, and may include, for example, an acrylate resin, a urethane resin, a silicone resin, or a mixture thereof, and among them, an acrylate resin is preferable. The particles described above may be the same or different in diameter, preferably in the range of about 2 μm to about 30 μm, more preferably in the range of about 5 μm to about 15 μm. The amount of the above-mentioned particles is preferably in the range of 10-30 wt% with respect to the total weight of the resin component in the hard coat layer.

  In order to prevent the optical film of the present invention from being damaged by other films, the optical film of the present invention includes a scratch-resistant layer having a smooth surface by coating a second hard coat layer on the lower side of the substrate. Provided. The thickness of the scratch-resistant layer is in the range of 1 μm to 10 μm, preferably in the range of 3 μm to 6 μm.

  FIG. 2 shows an embodiment of the scratch-resistant film according to the present invention. As shown in FIG. 2, the scratch-resistant optical film (20) according to the present invention is disposed on the upper side of the brightness enhancement film (10), and the upper side of the substrate (12) is a diffusion layer having a convex and concave structure ( 13), and the lower side of the substrate is a scratch-resistant layer (11) having a smooth surface.

  The UV curable resin that can be used in the hardcoat solution according to the present invention comprises at least one acrylic or acrylate monomer having one or more functional groups, with acrylate monomers being preferred. Examples of the acrylate monomer that can be used in the present invention include, but are not limited to, (meth) acrylate, urethane acrylate, polyester acrylate, and epoxy acrylate. Among these, (meth) acrylate is preferable.

  For example, acrylates that can be used in the present invention are methyl methacrylate, butyl acrylate, 2-phenoxyethyl acrylate, ethoxylated 2-phenoxyethyl acrylate, 2- (2-ethoxyethoxy) ethyl acrylate, cyclic trimethylolpropane formal acrylate, β- Carboxyethyl acrylate, lauryl (meth) acrylate, isooctyl acrylate, stearyl (meth) acrylate, isodecyl acrylate, isobornyl (meth) acrylate, benzyl acrylate, hydroxypivalyl hydroxypivalate diacrylate, ethoxylated 1,6-hexanediol Diacrylate, dipropylene glycol diacrylate, ethoxylated dipropylene glycol diacrylate, neopentyling Coal diacrylate, propoxylated neopentyl glycol diacrylate, ethoxylated bisphenol-A di (meth) acrylate, 2-methyl-1,3-propanediol diacrylate, ethoxylated 2-methyl-1,3-propanediol diacrylate 2-butyl-2-ethyl-1,3-propanediol diacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate phosphate, tris (2-hydroxyethyl) isocyanurate triacrylate, pentaerythritol triacrylate , Ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, trimethylolpropane trimethacrylate , Pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, di-trimethylolpropane tetraacrylate, propoxylated pentaerythritol tetraacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, methacrylate, hydroxyethyl acrylate, 2-hydroxy Ethyl methacrylate, tripropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meta) ) Acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, propoxylated glycero Tri (meth) acrylate is selected trimethylolpropane tri (meth) acrylate, and tris (acryloxy ethyl) isocyanurate, and mixtures thereof.

In order to enhance the film formation of the hard coat solution, the UV curable resin of the present invention may optionally comprise an oligomer having a molecular weight in the range of 10 ³ to 10 ⁴ . Such oligomers are well known to those skilled in the art, for example acrylate oligomers. Examples of the acrylate oligomer include urethane acrylates such as aliphatic urethane acrylate, aliphatic urethane hexaacrylate, and aromatic urethane hexaacrylate; epoxy acrylates such as bisphenol-A epoxy diacrylate and novolac epoxy acrylate; polyester acrylates such as polyester diacrylate Or include, but are not limited to, homo-acrylates.

The average molecular weight of the thermosetting resin that can be used in the hard coat solution of the present invention is typically from 10 ⁴ to 2 × 10 ⁶ , preferably from 2 × 10 ⁴ to 3 × 10 ⁵ , more preferably from 4 × 10 ^4. A range of 10 ⁵ . The thermosetting resin according to the present invention may be selected from the group consisting of polystyrene resin, polyester resin, epoxy resin, polyacrylate resin, polycarbonate, and mixtures thereof, among which polymethyl (meth) acrylate and other poly Acrylate resins are preferred. In order to enhance the crosslinkability, the thermosetting resin may optionally contain a hydroxy group (—OH), carboxy group (—COOH), or amino (—NH ₂ ) group-containing compound, preferably hydroxyethyl acrylate, Hydroxy group-containing compounds such as hydroxypropyl acrylate (HPA), 2-hydroxyethyl methacrylate (HEMA), or hydroxypropyl methacrylate (HPMA), or mixtures thereof may be included.

  Thermoplastic resins that can be used in the hard coat solution according to the present invention include polyolefin resins such as polyethylene (PE) and polypropylene (PP); polyester resins such as polyethylene terephthalate (PET); polyacrylate resins such as polymethyl methacrylate (PMMA); And mixtures thereof.

  During the processing and manufacturing of the resin material, when friction occurs within the resin material itself or between the resin material and other materials, static electricity is generated, thereby collecting dust that floats in the air on the surface. Thereby destroying expensive electronic devices and even causing fires by igniting combustible gases or powders. Therefore, it is usually necessary to add an antistatic agent.

  The hard coat solution according to the present invention can be obtained by blending an antistatic agent directly with a resin and then mixing. Antistatic agents that can be used in the hard coat solution of the present invention are not particularly limited and are well known to those skilled in the art. For example, ethoxyglycerin fatty acid esters, quaternary amine compounds, aliphatic amine derivatives, epoxy resins (for example, polyresins) Ethylene oxide, etc.), siloxanes, or alcohol derivatives such as polyethanol esters, polyethylene glycol ethers, and the like.

  According to an embodiment of the present invention, the first and second hard coat layers described above are provided by treating the hard coat solution in a manner that double cures with both heat and UV radiation, and the first and second hard coat layers. The hard coat solution used to form the coat layer may be the same or different and is selected from the group consisting of antistatic agents, UV curable resins, and thermosetting resins, thermoplastic resins and mixtures thereof. At least one resin.

  According to the present invention, the hard coat solution used to form the first and second hard coat layers optionally includes additives known to those skilled in the art, such as curing agents, photoinitiators. Including, but not limited to, leveling agents, dispersants or stabilizers.

  Curing agents used in the present invention are well known to those skilled in the art and are capable of crosslinking by allowing intermolecular chemical bonding. For example, although diisocyanate or polyisocyanate is mentioned, it is not restrict | limited to these.

  The photoinitiator used in the present invention generates free radicals by light irradiation and causes polymerization through the movement of free radicals. The photoinitiator that can be used in the present invention is not particularly limited. For example, benzophenone, benzoin, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,2-dimethoxy-1,2-diphenylethane-1 -One, 1-hydroxycyclohexyl phenyl ketone, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide, and mixtures thereof. Preferably, the photoinitiator is benzophenone or 1-hydroxycyclohexyl phenyl ketone.

The diffusion layer or scratch-resistant layer of the optical film according to the present invention may be produced according to any method known to those skilled in the art, and the method may be, for example, a method including the following steps.
(I) mixing a UV curable resin, a thermosetting resin, a solvent and an antistatic agent, and optionally a conventional additive to provide a colloidal hard coat solution;
(II) providing a coating by applying a hardcoat solution on top of the substrate surface;
(III) placing the coated substrate in an oven to evaporate the solvent, heating the substrate for several minutes at a temperature higher than the curing point of the thermosetting resin, and performing thermosetting polymerization;
(IV) Initiating photopolymerization by irradiating the coating with energy rays to provide a hard coat layer, and the intensity of the energy rays is in the range of 100 to 1000 mJ / cm ² , preferably 200 to 800 mJ / cm ² . The stage that is.

  If desired, the above steps may be repeated to provide multiple hardcoat layers.

  The optical film according to the present invention can be used in a backlight module having a brightness enhancement film, and is disposed on the light emitting side of the brightness enhancement film. The optical film according to the present invention has a hard coat layer formed by coating a new hard coat solution on the substrate surface, the hard coat layer can effectively improve the hardness, and has a contact means. Protect and provide a smooth surface with no deflection, thereby avoiding effects on optical properties. Furthermore, since the substrate surface has a coating having convex and concave structures, the optical film according to the present invention also has a diffusion function, and can be used as a protective diffusion film in a backlight module of a display.

  The following examples are used only to further illustrate the invention and are not intended to limit the scope of the invention. All modifications and changes readily made by those skilled in the art are within the scope of this description and the appended claims.

Example 1
First hard coat layer (diffusion layer)
In a 250 ml glass bottle 20 g toluene and 6 g butanone were added as solvent. In order to prepare a coating material having a total weight of about 54.6 g and a solid content of about 40% while stirring at high speed, the following substances were added in order: acrylic particles having an average particle size of 8 μm [MB30X-8, Sekisui Plastics Industrial Co., Ltd.] 3 g; UV curable resin: 12 g in total of a mixture of 2-hydroxyethyl methacrylate, methyl methacrylate, butyl acrylate, and pentaerythritol triacrylate monomer; Thermosetting resin: 10 g of acrylate resin [Eterac 7363-ts- 50, Eternal Co. (Solid content 50%); curing agent 1.0 g [Desmodur 3390, Bayer Co. ] (Solid content 75%), antistatic agent 2.0 g [GMB-36M-AS, Marubishi Oil Chem. Co. Ltd .. (Solid content 20%); photoinitiator: 0.6 g total of a mixture of benzophenone and 1-hydroxycyclohexyl phenyl ketone. The coating material was an RDS bar coater # 8 and a 188 μm thick PET substrate [U34, TORAY Co. ], Dried at 100 ° C. for 1 minute, and then at a speed and power set of 15 m / min to an energy beam of 200 mJ / cm ^{2 in} a UV exposure device [Fusion UV, F600V, 600 W / inch, H type lamp source] A first hard coat layer (diffusion layer) having a coating thickness of 10 μm, which was exposed at 100%, was provided.

Second hard coat layer (scratch resistant layer)
In a 250 ml glass bottle, 16 g of toluene and 13 g of butanone were added as solvents. The following substances were added in order to prepare a coating material having a total weight of about 57.6 g and a solid content of about 30% while stirring at high speed: UV curable resin: 2-hydroxyethyl methacrylate, methyl methacrylate, butyl 8 g total mixture of acrylate and pentaerythritol triacrylate monomer; thermosetting resin: 16 g acrylate resin [Eterac 7363-ts-50, Eternal Co. ] (Solid content 50%); 1.6 g curing agent [Desmodur 3390, Bayer Co. ] (Solid content 75%); 1.6 g of antistatic agent [GMB-36M-AS, Marubishi Oil Chem. Co. , Ltd., Ltd. (Solid content 20%); photoinitiator: 0.6 g total of a mixture of benzophenone and 1-hydroxycyclohexyl phenyl ketone. The coating material is coated on the other surface of the above-mentioned PET substrate coated with the first hard coat layer by an RDS bar coater # 6, dried at 100 ° C. for 1 minute, and then exposed to a UV exposure device [Fusion UV, F600V, 600 W / Inch, H-type lamp source] is exposed to an energy ray of 200 mJ / cm ² at a speed of 15 m / min and a power set of 100%, and a second hard coat layer (scratch resistant layer) having a coating thickness of about 5 μm is provided. It was. The resulting scratch-resistant optical film has a total film thickness of 202 μm and was tested for various properties and the results obtained are shown in Table 1 below.

Comparative Example 1
A commercially available protective diffusion film with a thickness of 200 μm [D117VGZ, Tsujiden Co. ] Were tested for various properties and the results obtained are shown in Table 1 below.

Comparative Example 2
A commercially available protective diffusion film with a thickness of 200 μm [PBS072, Keiwa Co. ] Were tested for various properties and the results obtained are shown in Table 1 below.

Comparative Example 3
A commercially available protective diffusion film having a thickness of 205 μm [JS153-R, SKC Co. ] Were tested for various properties and the results obtained are shown in Table 1 below.

Test results:
Transparent material brightness test:
According to the JIS K7136 standard method, the test sample was measured for haze (Hz) and total transmittance (Tt) with an NDH5000W haze meter (Nippon Denshoku Industries Co., Ltd.). The results obtained are shown in Table 1 below.

Pencil hardness test:
According to JIS K-5400 method, the test sample was tested with a pencil hardness tester [Elcometer 3086, SCRATCH BOY] using a Mitsubishi pencil (2H, 3H). The results obtained are shown in Table 1 below.

Surface resistance test:
The test sample was a Superinsulation Meter [EASTASIA TOADKK Co. , SM8220 & SME8310, 500V]. The measurement conditions were as follows: 23 ± 2 ° C. and RH55 ± 5%. The results obtained are shown in Table 1 below.

Scratch resistance test:
A linear wear tester [TABER 5750] was used and a 3M BEF-III-10T film (length 20 mm x width 20 mm) was fixed on a 600 g platform (area: length 20 mm x width 20 mm). Test samples were tested for scratch resistance under direct pressure on the prismatic microstructured layer of film. The scratch resistance test was performed for 10 cycles at a test pass of 2 inches and a rate of 10 cycles / minute. The results obtained are shown in Table 1 below.

Deflection test:
The test sample was cut into a flat film 100 mm long × 100 mm wide, placed in an oven at 120 ° C. for 10 minutes, then removed and left at room temperature (RT). After cooling to RT, the film is measured for square deflection level with a gap gauge (recording unit: millimeter, recording method: eg 0; 0; 0; 0), whereby the test sample is heat and flex resistant. Was evaluated. The results obtained are shown in Table 1 below.

  From the results of the examples and comparative examples, the scratch-resistant optical film according to the present invention has excellent antistatic properties and high hardness properties, and its surface is at a level without deflection, thereby adversely affecting the optical properties. Avoid receiving.

FIG. 4 is a simplified schematic diagram of a backlight module with various optical films. FIG. 2 is a simplified schematic diagram of an embodiment of a scratch-resistant optical film according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reflective film 2 Light guide 3 Diffusion film 4,5 Brightness increase film 6 Protective diffusion film 10 Brightness increase film 11 Scratch resistant layer 12 Substrate 13 Diffusion layer 20 Scratch resistant optical film

Claims (20)

(A) a transparent substrate;
(B) a diffusion layer on the upper side of the substrate having a convex and concave structure and comprising a first hard coat layer;
(C) a scratch-resistant layer on the lower side of the substrate having a smooth surface and comprising a second hard coat layer,
The scratch-resistant optical film, wherein the first and second hard coat layers have a surface resistance in the range of 10 ⁸ to 10 ¹² O / □, and have a pencil hardness of 3H or more when measured according to JIS K5400 standard method. The first and second hard coat layers are provided by treating the hard coat solution in a manner that double cures with both heat and UV radiation,
The hard coat solutions used to form the first and second hard coat layers are the same or different, and include antistatic agents, UV curable resins, thermosetting resins, thermoplastic resins and their The scratch-resistant optical film according to claim 1, comprising at least one resin selected from the group consisting of a mixture.   The scratch-resistant optical film according to claim 1, wherein the transparent substrate is plastic or glass.   The scratch-resistant optical film according to claim 1, wherein the diffusion layer has a thickness in the range of 5 μm to 20 μm.   The scratch-resistant optical film according to claim 2, wherein the first hard coat layer further comprises organic particles in an amount ranging from 10 to 30 wt% with respect to the total weight of the resin component in the hard coat layer.   The scratch-resistant optical film according to claim 5, wherein the organic particles are selected from the group consisting of acrylate resins, urethane resins, silicone resins, and mixtures thereof.   The scratch-resistant optical film according to claim 5, wherein the organic particles have a diameter in a range of 2 μm to 30 μm.   The scratch-resistant optical film according to claim 1, wherein the scratch-resistant layer has a thickness of 1 µm to 10 µm.   The scratch-resistant optical film according to claim 2, wherein the antistatic agent is selected from the group consisting of epoxy glycerin fatty acid esters, quaternary amine compounds, aliphatic amine derivatives, polyethylene oxide, siloxane, and alcohol derivatives.   The scratch-resistant optical film according to claim 2, wherein the UV curable resin contains at least one acrylic or acrylate monomer having one or more functional groups.   The scratch-resistant optical film according to claim 10, wherein the acrylate monomer is (meth) acrylate, urethane acrylate, polyester acrylate, or epoxy acrylate.   The scratch-resistant optical film according to claim 10, wherein the UV curable resin further comprises an acrylate oligomer.   The scratch-resistant optical film according to claim 2, wherein the thermosetting resin is selected from the group consisting of polystyrene resin, polyester resin, epoxy resin, polyacrylate resin, polycarbonate, and a mixture thereof.   The scratch-resistant optical film according to claim 2, wherein each of the hard coat solutions used to form the first and second hard coat layers further contains an additive.   The scratch-resistant optical film according to claim 1, wherein the haze of the optical film is in the range of 20% to 90% when measured according to JIS K7136 standard method.   The scratch-resistant optical film according to claim 1, wherein the light transmittance of the optical film is in the range of 85% to 95%. (A) a transparent substrate;
(B) a diffusion layer on one surface of the substrate having a convex and concave structure and comprising a first hard coat layer;
(C) a scratch-resistant layer on the other surface of the substrate having a smooth surface and comprising a second hard coat layer;
The first and second hard coat layers have a surface resistance in the range of 10 ⁸ to 10 ¹² O / □, and have a pencil hardness of 3H or more when measured according to JIS K5400 standard method,
The first and second hard coat layers are provided by treating the hard coat solution in a manner that double cures with both heat and UV radiation,
The hard coat solutions used to form the first and second hard coat layers are the same or different and comprise an antistatic agent, a UV curable resin, and a thermosetting resin;
Scratch-resistant film with no deflection.   18. The scratch-resistant optical film according to claim 17, wherein the haze of the optical film is in the range of 20% to 90% when measured according to JIS K7136 standard method.   18. The scratch-resistant optical film according to claim 17, wherein the light transmittance of the optical film is in the range of 85% to 95%.   The scratch-resistant optical film according to any one of claims 1 to 19, for use as a protective diffusion film in a backlight module of a display.

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